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Restricting entry from keyboard [message #440979]

Thu, 28 January 2010 03:30

athar.fitfd@hotmail.com
Messages: 193
Registered: October 2007
Location: pakistan

Senior Member

Hi everyone

i am working on attendance system using barcode scanner.

i want the user can only mark his/her attendance by scanning the attendance card.

and cannot use keyboard.

Thanks in anticipation

Regards

Athar

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Re: Restricting entry from keyboard [message #440986 is a reply to message #440979]

Thu, 28 January 2010 03:51

Littlefoot
Messages: 21823
Registered: June 2005
Location: Croatia, Europe

Senior Member
Account Moderator

I don't think that you can do that programatically. Barcode scanner "emulates" a keyboard. Moreover, it is *usually* plugged into the same cable port as the keyboard. So, it doesn't matter what the input is - keyboard or scanner - the result is the same.

Therefore, you'll need to do something "physically" - lock the keyboard into a box, take keys out of the keyboard, hide it behind the wall ... whatever.

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Re: Restricting entry from keyboard [message #445460 is a reply to message #440979]

Tue, 02 March 2010 00:05

djmartin
Messages: 10181
Registered: March 2005
Location: Surges Bay TAS Australia

Senior Member
Account Moderator

Sorry that I have been so long in replying. Have you solved your problem?

Remove the keyboard from the machine or lock it in a drawer.

David

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Re: Restricting entry from keyboard [message #445697 is a reply to message #445460]

Wed, 03 March 2010 06:54

athar.fitfd@hotmail.com
Messages: 193
Registered: October 2007
Location: pakistan

Senior Member

Sory david

this is not solution of the problem.

Regards

Athar

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Re: Restricting entry from keyboard [message #445700 is a reply to message #440979]

Wed, 03 March 2010 07:03

Martin Eysackers
Messages: 80
Registered: October 2005
Location: Belgium

Member

I've seen a complex solution to this (don't have the code sorry)
where timers where used to detect input
if input in a field is done then the time to fill this field is calculated, if time < certain value then input was scanner else keyboard and raise form_trigger_failure

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Re: Restricting entry from keyboard [message #445706 is a reply to message #440979]

Wed, 03 March 2010 07:16

cookiemonster
Messages: 13963
Registered: September 2008
Location: Rainy Manchester

Senior Member

That wouldn't work if someone used ctrl-v to paste in the value.

@athar.fitfd@hotmail.com - removing the keyboard is the only solution that is guaranteed to work. Not what you want to hear but true all the same.

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Re: Restricting entry from keyboard [message #445710 is a reply to message #440979]

Wed, 03 March 2010 07:39

Martin Eysackers
Messages: 80
Registered: October 2005
Location: Belgium

Member

point well taken

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Re: Restricting entry from keyboard [message #445968 is a reply to message #445710]

Thu, 04 March 2010 23:17

athar.fitfd@hotmail.com
Messages: 193
Registered: October 2007
Location: pakistan

Senior Member

Thanks for taking interest.

if i removed keyboard then how can i type the password for window login.

Thanks

Athar

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Re: Restricting entry from keyboard [message #445976 is a reply to message #445968]

Fri, 05 March 2010 00:10

Littlefoot
Messages: 21823
Registered: June 2005
Location: Croatia, Europe

Senior Member
Account Moderator

Create a barcode with user's password, print it and let user read it via barcode reader.

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Re: Restricting entry from keyboard [message #447408 is a reply to message #445976]

Mon, 15 March 2010 01:32

djmartin
Messages: 10181
Registered: March 2005
Location: Surges Bay TAS Australia

Senior Member
Account Moderator

Print out all the characters and numbers with their barcodes and make the user 'flash' each character, one at a time.

David

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